Patent US3803522A successfully refreshed from Google Patents.
US3803522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air gap extending the width of a permanent magnet assembly
Assignee: Arnold Engineering Co
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Filing: 1973-05-11
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Granted: 1974-04-09
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Expires: 1993-05-11
Abstract
Abstract A magnet assembly includes a permanent magnet having a pair of steel plates one fastened to each of its top and bottom sides. In one embodiment the magnet and plates are tubular with the inside diameter of the magnet being substantially greater than the inside diameter of the plates. A steel outer pole piece is secured to the inside opening of the plates in spaced relationship to a steel inner pole piece so as to provide an air gap therebetween. In another embodiment the plates are solid with the plates having a substantially greater diameter than the magnet. An inner steel pole piece is secured to the outer periphery of the plates in spaced relationship to an outer steel pole piece so as to provide an air gap therebetween. In each embodiment a coil is received in the air gap.
Inventors
- 👤 R Rooney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:58
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F7/0273; H01F7/0289
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
149 words
A magnet assembly comprising a permanent magnet having top and bottom sides, said magnet being magnetized parallel to its length, a pair of plates of magnetizable material one secured to each of said sides, an inner pole piece of magnetizable material, a tubular outer pole piece of magnetizable material, the outer diameter of said inner pole piece being less than the inner diameter of said outer pole piece, one of said pole pieces extending between and secured to said plates in spaced relationship to said magnet, said pole pieces extending beyond said top and bottom sides, and means holding said inner and outer pole pieces in spaced apart relationship to provide an air gap of substantially uniform width around the periphery thereof extending beyond said top and bottom sides whereby the flux created by said magnet passes through said air gap beyond said top and bottom sides in series.
Claim 2
Dependent Claim
149 words
A magnet assembly comprising a permanent magnet having top and bottom sides, said magnet being magnetized parallel to its length, a pair of plates of magnetizable material one secured to each of said sides, an inner pole piece of magnetizable material, a tubular outer pole piece of magnetizable material, the outer diameter of said inner pole piece being less than the inner diameter of said outer pole piece, one of said pole pieces extending between and secured to said plates in spaced relationship to said magnet, said pole pieces extending beyond said top and bottom sides, and means holding said inner and outer pole pieces in spaced apart relationship to provide an air gap of substantially uniform width around the periphery thereof extending beyond said top and bottom sides whereby the flux created by said magnet passes through said air gap beyond said top and bottom sides in series.
Claim 3
Dependent Claim
25 words
An assembly according to claim 1 including a tubular coil mounted in said air gap for relative axial movement with respect to said pole pieces.
Claim 4
Dependent Claim
38 words
An assembly according to claim 1 in which said means holding said inner and outer pole pieces in spaced apart relationship includes a non-magnetizable plate secured to one of said first named plates and to said pole pieces.
Claim 5
Dependent Claim
25 words
An assembly according to claim 3 including a tubular coil mounted in said air gap for relative axial movement with respect to said pole pieces.
Claim 6
Dependent Claim
45 words
An assembly according to claim 1 in which said magnet, plates and pole pieces are separate coaxial cylinders fastened together and the ends of said pole pieces extend to the outer side of said plates, said plates and pole pieces being made of ferromagnetic material.
Claim 7
Dependent Claim
25 words
An assembly according to claim 5 including a tubular coil mounted in said air gap for relative axial movement with respect to said pole pieces.
Claim 8
Dependent Claim
38 words
An assembly according to claim 6 in which said means holding said inner and outer pole pieces in spaced apart relationship includes a non-magnetizable plate secured to one of said first named plates and to said pole pieces.
Claim 9
Dependent Claim
33 words
An assembly according to claim 7 in which said coil incudes a tube of non-magnetizable material, and a coil of electrical conducting material on said tube wound in opposite directions from its center.
Claim 10
Dependent Claim
65 words
An assembly according to claim 1 in which said permanent magnet and said plates are tubular in shape, the inner diameter of said magnet being substantially greater than the outer diameter of said outer pole piece so as to provide a space therebetween substantially greater than the width of said air gap, said outer pole piece being secured to the inside openings of said plates.
Claim 11
Dependent Claim
20 words
An assembly according to claim 9 in which said outer pole piece has a central slot around its outside periphery.
Claim 12
Dependent Claim
38 words
An assembly according to claim 10 in which said means holding said inner and outer pole pieces in spaced apart relationship includes a non-magnetizable plate secured to one of said first named plates and to said pole pieces.
Claim 13
Dependent Claim
25 words
An assembly according to claim 11 including a tubular coil mounted in said air gap for relative axial movement with respect to said pole piece.
Claim 14
Dependent Claim
42 words
An assembly according to claim 1 in which said inner pole piece is tubular in shape, the diameter of said plates being substantially greater thaN the diameter of said magnet, said plates being secured to the inside of said inner pole piece.
Claim 15
Dependent Claim
20 words
An assembly according to claim 13 in which said inner pole piece has a central slot around its inside periphery.
Claim 16
Dependent Claim
38 words
An assembly according to claim 14 in which said means holding said inner and outer pole pieces in spaced apart relationship includes a non-magnetizable plate secured to one of said first named plates and to said pole pieces.
Claim 17
Dependent Claim
25 words
An assembly according to claim 15 including a tubular coil mounted in said air gap for relative axial movement with respect to said pole pieces.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |